ssl – How to Disable TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 Cipher in Apache2

If their only complaint is MD5-based MAC, you should be able to simply add the !MD5 element to your existing cipher suite to meet the recommendation.

That said, I see they complain about the use of the CBC mode as well. Unfortunately, there is no CBC cipher group. The recommendation given to you also does not exclude CBC mode cipherspecs, at least on my version of openSSL (1.0.1e). This is a shame. If you need all such ciphers to be excluded, you could exclude all the CBC ones explicitly, though you will have to update that as they are included. Note that even HIGH includes CBC ciphers.

Including both ALL and RC4+RSA is redundant. I would be loathe to trust a security consultant (even a computerized one) that cannot even construct a well-formed cipherspec that meets their own recommendations.

The SSLCipherSuite takes an OpenSSL cipher spec. You can find this in the openssl documentation (link), but I find that this documentation is usually quite out of date. However, you can test one by running openssl ciphers ${cipherspec} on your server; output will be a :-separated list of ciphers that would be allowed by the given spec, or an error indicating none were allowed.

Similarly, if you want to know what LOW contains, do:

falcon@tiernyn ~ $ openssl ciphers 'LOW'
EDH-RSA-DES-CBC-SHA:EDH-DSS-DES-CBC-SHA:ADH-DES-CBC-SHA:DES-CBC-SHA:DES-CBC-MD5

!LOW means to exclude those ones. +HIGH means to prefer the high-security ones in the ordering.

If you want a line-delimited list of all the ciphers that use CBC in your cipherspec, do:

openssl ciphers ${cipherspec} | sed 's/:/\n/g' | grep CBC

Those are the ones you'd have to exclude. You may, however, find it more reasonable to grep -v CBC and include only those (just set them up in a :-delimited list and use that as the cipherspec).

As explained here you may have to set the ciphers list like this :

sslProtocols = "TLS"
ciphers="TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA,
TLS_RSA_WITH_AES_25‌​6_CBC_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA,SSL_RSA_WITH_RC4_128_SHA"

The first part, ECDHE, specifies what key exchange algorithm should be used. [...]

Next up is the authentication algorithm, RSA. [...]

The bulk cipher, AES128-GCM is the main encryption algorithm and used to encrypt all the traffic. [...]

The last part, SHA256, identifies the message digest in use, which verifies the authenticity of messages.